School administrators told investigators that a student made written violent threats directed toward other students and school board officials. The writings were turned over to police, Sticker said.

St. Tammany Parish school system spokeswoman Meredith Mendez said the parents of students specifically named in the written threats received a personal phone call from the principal after the incident on Wednesday. A phone message was sent out to all Mandeville Junior High parents on Thursday informing them of the situation, she said.

"Mandeville Police have assured us that the school is safe and that at no time were any students or staff members in any danger," Mendez said.

Mendez said she can't comment on any specific disciplinary action being taken against the student, but she said the school's standard disciplinary procedures will be followed. She also declined to comment on the exact nature of the threats that were made.

Katherine Sayre contributed to this report.

Correction: An earlier version of this story said a student was arrested based on information Nola.com | The Times-Picayune received from the police department. Police have now said the student was detained and has not yet been arrested.